INVESTIGADORES
MONTICELLI Fernando Gabriel
artículos
Título:
Search for FCNC single top-quark production at √s =7 TeV with the ATLAS detector
Autor/es:
ATLAS COLLABORATION, G. AAD, F. MONTICELLI, ET AL
Revista:
PHYSICS LETTERS B
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2012 vol. 213 p. 1 - 23
ISSN:
0370-2693
Resumen:
Results on the search for flavor-changing
neutral-current single top-quark production are reported. Data collected
with the ATLAS detector at a center-of-mass energy of sqrt(s) = 7 TeV
and corresponding to an integrated luminosity of 2.05 fb^-1 are used.
Candidate events with a leptonic top-quark decay signature are
classified into signal- and background-like events using a neural
network. No signal is observed in the output distribution and a Bayesian
upper limit on the production cross-section is placed. The observed 95%
C.L. upper limit on the cross-section multiplied by the t -> Wb
branching fraction is measured to be sigma(qg -> t) x B(t -> Wb)
< 3.9 pb. This upper limit can be converted into an upper limit of
the coupling strength k_ugt/Lambda < 6.9 x 10^-3 TeV^-1 and
k_cgt/Lambda < 1.6 x 10^-2 TeV^-1 and on the branching fractions B(t
-> ug) < 5.7 x 10^-5 and B(t -> cg) < 2.7 x 10^-4.